Holographic stars

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Abstract
Holographic stars fabricated on DuPont’s holographic recording film HRF 600X010 by the use of He–Ne laser light are demonstrated. The stars operate with plane waves, the transmitted portions of the input beams are used at the corresponding outputs, and the gratings are in the volume regime of diffraction. Multiple exposure based on the Bragg degeneracy effect is employed, which drastically reduces the number of multiplexed gratings and requires a three-dimensional arrangement of the replay beams.The star operates at different wavelengths only by the readjustment of the Bragg angles.